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0.09x+0.13(x+9000)=1830
We move all terms to the left:
0.09x+0.13(x+9000)-(1830)=0
We multiply parentheses
0.09x+0.13x+1170-1830=0
We add all the numbers together, and all the variables
0.22x-660=0
We move all terms containing x to the left, all other terms to the right
0.22x=660
x=660/0.22
x=3000
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